Replaying what happened. Checking your phone before you've decided to. Looking fine on the outside while you fall apart underneath.
You're not losing your mind. Almost every woman who's been through this says the same thing.
Your nervous system is dysregulated. That's not something you decide your way out of. It's something you calm your way out of, first.
So no, you don't have to decide anything right now. Look around. There's no pressure to buy anything today.
Right now, your mind belongs to him. By the end of this, it belongs to you again. The first step isn't knowing everything. It's calming your nervous system enough to see clearly.